TYPO3 is a free Open Source content management system for enterprise purposes on the web and in intranets. It offers full flexibility and extendability while featuring an accomplished set of ready-made interfaces, functions and modules.

Rich Text Editor (RTE) : Multiple RTEs with Microsoft Word-like icons, support for Win/IE, Mac/Safari and Mozilla Firefox on all platforms; WYSIWYG editors are highly configurable - buttons and CSS styles can be added and removed.

Intuitive UI : The site is organized and displayed in the backend in a page-tree format that duplicates the structural layout of the site. File management functions are displayed in a directory-tree format that duplicates the directory structure of the installation. This makes finding pages and files easy for content editors.

Configurable UI Levels : Customizable/Skinnable backend interface for editors (expert or newbie interfaces); Help icons are located beside most functions.

Undo / History : TYPO3 CMS has an unlimited history. You can undo any change you make on the site.

Frontend or Backend Editing : Users can choose to edit in either the frontend (directly on the webpage) or the TYPO3 CMS backend.

Very steep learning curve. Sometimes it can be hard to do certain things that require programming but if you are not super skilled at making websites, and have patience to learn the platform, you can make a really nice, professional site with this and you will get a hang of how it works. I'm making my second site now and I don't want to use another platform because this is so clean and clear.